a0409b4399
- In rare cases, if a parent process traps SIGPIPE, the 'tr' command in the VPN setup scripts could output an error 'tr: write error: Broken pipe'. This is a cosmetic error that does NOT affect the functionality of the scripts. This commit hides the error in such cases.
567 lines
16 KiB
Bash
Executable File
567 lines
16 KiB
Bash
Executable File
#!/bin/sh
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#
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# Script for automatic setup of an IPsec VPN server on Ubuntu and Debian
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# Works on any dedicated server or virtual private server (VPS)
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#
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# DO NOT RUN THIS SCRIPT ON YOUR PC OR MAC!
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#
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# The latest version of this script is available at:
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# https://github.com/hwdsl2/setup-ipsec-vpn
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#
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# Copyright (C) 2014-2021 Lin Song <linsongui@gmail.com>
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# Based on the work of Thomas Sarlandie (Copyright 2012)
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#
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# This work is licensed under the Creative Commons Attribution-ShareAlike 3.0
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# Unported License: http://creativecommons.org/licenses/by-sa/3.0/
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#
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# Attribution required: please include my name in any derivative and let me
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# know how you have improved it!
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# =====================================================
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# Define your own values for these variables
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# - IPsec pre-shared key, VPN username and password
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# - All values MUST be placed inside 'single quotes'
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# - DO NOT use these special characters within values: \ " '
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YOUR_IPSEC_PSK=''
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YOUR_USERNAME=''
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YOUR_PASSWORD=''
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# Important notes: https://git.io/vpnnotes
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# Setup VPN clients: https://git.io/vpnclients
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# IKEv2 guide: https://git.io/ikev2
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# =====================================================
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export PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
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SYS_DT=$(date +%F-%T | tr ':' '_')
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exiterr() { echo "Error: $1" >&2; exit 1; }
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exiterr2() { exiterr "'apt-get install' failed."; }
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conf_bk() { /bin/cp -f "$1" "$1.old-$SYS_DT" 2>/dev/null; }
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bigecho() { echo "## $1"; }
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check_ip() {
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IP_REGEX='^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$'
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printf '%s' "$1" | tr -d '\n' | grep -Eq "$IP_REGEX"
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}
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vpnsetup() {
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os_type=$(lsb_release -si 2>/dev/null)
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os_arch=$(uname -m | tr -dc 'A-Za-z0-9_-')
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[ -z "$os_type" ] && [ -f /etc/os-release ] && os_type=$(. /etc/os-release && printf '%s' "$ID")
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case $os_type in
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[Uu]buntu)
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os_type=ubuntu
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;;
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[Dd]ebian)
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os_type=debian
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;;
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[Rr]aspbian)
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os_type=raspbian
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;;
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*)
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echo "Error: This script only supports Ubuntu and Debian." >&2
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echo "For CentOS/RHEL, use https://git.io/vpnsetup-centos" >&2
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exit 1
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;;
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esac
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os_ver=$(sed 's/\..*//' /etc/debian_version | tr -dc 'A-Za-z0-9')
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if [ "$os_ver" = "8" ] || [ "$os_ver" = "jessiesid" ]; then
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exiterr "Debian 8 or Ubuntu < 16.04 is not supported."
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fi
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if [ "$os_ver" = "10" ] && [ ! -e /dev/ppp ]; then
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exiterr "/dev/ppp is missing. Debian 10 users, see: https://git.io/vpndebian10"
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fi
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if [ -f /proc/user_beancounters ]; then
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exiterr "OpenVZ VPS is not supported."
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fi
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if [ "$(id -u)" != 0 ]; then
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exiterr "Script must be run as root. Try 'sudo sh $0'"
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fi
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def_iface=$(route 2>/dev/null | grep -m 1 '^default' | grep -o '[^ ]*$')
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[ -z "$def_iface" ] && def_iface=$(ip -4 route list 0/0 2>/dev/null | grep -m 1 -Po '(?<=dev )(\S+)')
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def_state=$(cat "/sys/class/net/$def_iface/operstate" 2>/dev/null)
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if [ -n "$def_state" ] && [ "$def_state" != "down" ]; then
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if ! uname -m | grep -qi -e '^arm' -e '^aarch64'; then
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case $def_iface in
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wl*)
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exiterr "Wireless interface '$def_iface' detected. DO NOT run this script on your PC or Mac!"
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;;
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esac
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fi
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NET_IFACE="$def_iface"
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else
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eth0_state=$(cat "/sys/class/net/eth0/operstate" 2>/dev/null)
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if [ -z "$eth0_state" ] || [ "$eth0_state" = "down" ]; then
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exiterr "Could not detect the default network interface."
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fi
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NET_IFACE=eth0
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fi
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[ -n "$YOUR_IPSEC_PSK" ] && VPN_IPSEC_PSK="$YOUR_IPSEC_PSK"
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[ -n "$YOUR_USERNAME" ] && VPN_USER="$YOUR_USERNAME"
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[ -n "$YOUR_PASSWORD" ] && VPN_PASSWORD="$YOUR_PASSWORD"
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if [ -z "$VPN_IPSEC_PSK" ] && [ -z "$VPN_USER" ] && [ -z "$VPN_PASSWORD" ]; then
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bigecho "VPN credentials not set by user. Generating random PSK and password..."
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VPN_IPSEC_PSK=$(LC_CTYPE=C tr -dc 'A-HJ-NPR-Za-km-z2-9' </dev/urandom 2>/dev/null | head -c 20)
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VPN_USER=vpnuser
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VPN_PASSWORD=$(LC_CTYPE=C tr -dc 'A-HJ-NPR-Za-km-z2-9' </dev/urandom 2>/dev/null | head -c 16)
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fi
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if [ -z "$VPN_IPSEC_PSK" ] || [ -z "$VPN_USER" ] || [ -z "$VPN_PASSWORD" ]; then
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exiterr "All VPN credentials must be specified. Edit the script and re-enter them."
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fi
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if printf '%s' "$VPN_IPSEC_PSK $VPN_USER $VPN_PASSWORD" | LC_ALL=C grep -q '[^ -~]\+'; then
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exiterr "VPN credentials must not contain non-ASCII characters."
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fi
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case "$VPN_IPSEC_PSK $VPN_USER $VPN_PASSWORD" in
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*[\\\"\']*)
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exiterr "VPN credentials must not contain these special characters: \\ \" '"
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;;
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esac
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if { [ -n "$VPN_DNS_SRV1" ] && ! check_ip "$VPN_DNS_SRV1"; } \
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|| { [ -n "$VPN_DNS_SRV2" ] && ! check_ip "$VPN_DNS_SRV2"; } then
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exiterr "The DNS server specified is invalid."
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fi
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if [ -x /sbin/iptables ] && ! iptables -nL INPUT >/dev/null 2>&1; then
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exiterr "IPTables check failed. Reboot and re-run this script."
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fi
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bigecho "VPN setup in progress... Please be patient."
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mkdir -p /opt/src
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cd /opt/src || exit 1
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count=0
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APT_LK=/var/lib/apt/lists/lock
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PKG_LK=/var/lib/dpkg/lock
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while fuser "$APT_LK" "$PKG_LK" >/dev/null 2>&1 \
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|| lsof "$APT_LK" >/dev/null 2>&1 || lsof "$PKG_LK" >/dev/null 2>&1; do
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[ "$count" = "0" ] && bigecho "Waiting for apt to be available..."
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[ "$count" -ge "100" ] && exiterr "Could not get apt/dpkg lock."
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count=$((count+1))
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printf '%s' '.'
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sleep 3
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done
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bigecho "Installing packages required for setup..."
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export DEBIAN_FRONTEND=noninteractive
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(
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set -x
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apt-get -yqq update
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) || exiterr "'apt-get update' failed."
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(
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set -x
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apt-get -yqq install wget dnsutils openssl \
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iptables iproute2 gawk grep sed net-tools >/dev/null
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) || exiterr2
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bigecho "Trying to auto discover IP of this server..."
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# In case auto IP discovery fails, enter server's public IP here.
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public_ip=${VPN_PUBLIC_IP:-''}
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check_ip "$public_ip" || public_ip=$(dig @resolver1.opendns.com -t A -4 myip.opendns.com +short)
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check_ip "$public_ip" || public_ip=$(wget -t 3 -T 15 -qO- http://ipv4.icanhazip.com)
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check_ip "$public_ip" || exiterr "Cannot detect this server's public IP. Edit the script and manually enter it."
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bigecho "Installing packages required for the VPN..."
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(
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set -x
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apt-get -yqq install libnss3-dev libnspr4-dev pkg-config \
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libpam0g-dev libcap-ng-dev libcap-ng-utils libselinux1-dev \
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libcurl4-nss-dev flex bison gcc make libnss3-tools \
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libevent-dev libsystemd-dev uuid-runtime ppp xl2tpd >/dev/null
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) || exiterr2
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bigecho "Installing Fail2Ban to protect SSH..."
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(
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set -x
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apt-get -yqq install fail2ban >/dev/null
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) || exiterr2
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bigecho "Downloading IKEv2 script..."
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ikev2_url="https://github.com/hwdsl2/setup-ipsec-vpn/raw/master/extras/ikev2setup.sh"
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(
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set -x
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wget -t 3 -T 30 -q -O ikev2.sh "$ikev2_url"
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) || /bin/rm -f ikev2.sh
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[ -s ikev2.sh ] && chmod +x ikev2.sh && ln -s /opt/src/ikev2.sh /usr/bin 2>/dev/null
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bigecho "Downloading Libreswan..."
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SWAN_VER=4.4
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swan_file="libreswan-$SWAN_VER.tar.gz"
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swan_url1="https://github.com/libreswan/libreswan/archive/v$SWAN_VER.tar.gz"
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swan_url2="https://download.libreswan.org/$swan_file"
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(
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set -x
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wget -t 3 -T 30 -q -O "$swan_file" "$swan_url1" || wget -t 3 -T 30 -q -O "$swan_file" "$swan_url2"
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) || exit 1
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/bin/rm -rf "/opt/src/libreswan-$SWAN_VER"
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tar xzf "$swan_file" && /bin/rm -f "$swan_file"
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bigecho "Compiling and installing Libreswan, please wait..."
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cd "libreswan-$SWAN_VER" || exit 1
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cat > Makefile.inc.local <<'EOF'
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WERROR_CFLAGS=-w -s
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USE_DNSSEC=false
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USE_DH2=true
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USE_NSS_KDF=false
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FINALNSSDIR=/etc/ipsec.d
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EOF
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if ! grep -qs 'VERSION_CODENAME=' /etc/os-release; then
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cat >> Makefile.inc.local <<'EOF'
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USE_DH31=false
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USE_NSS_AVA_COPY=true
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USE_NSS_IPSEC_PROFILE=false
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USE_GLIBC_KERN_FLIP_HEADERS=true
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EOF
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fi
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if ! grep -qs IFLA_XFRM_LINK /usr/include/linux/if_link.h; then
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echo "USE_XFRM_INTERFACE_IFLA_HEADER=true" >> Makefile.inc.local
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fi
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NPROCS=$(grep -c ^processor /proc/cpuinfo)
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[ -z "$NPROCS" ] && NPROCS=1
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(
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set -x
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make "-j$((NPROCS+1))" -s base >/dev/null && make -s install-base >/dev/null
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)
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cd /opt/src || exit 1
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/bin/rm -rf "/opt/src/libreswan-$SWAN_VER"
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if ! /usr/local/sbin/ipsec --version 2>/dev/null | grep -qF "$SWAN_VER"; then
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exiterr "Libreswan $SWAN_VER failed to build."
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fi
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bigecho "Creating VPN configuration..."
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L2TP_NET=${VPN_L2TP_NET:-'192.168.42.0/24'}
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L2TP_LOCAL=${VPN_L2TP_LOCAL:-'192.168.42.1'}
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L2TP_POOL=${VPN_L2TP_POOL:-'192.168.42.10-192.168.42.250'}
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XAUTH_NET=${VPN_XAUTH_NET:-'192.168.43.0/24'}
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XAUTH_POOL=${VPN_XAUTH_POOL:-'192.168.43.10-192.168.43.250'}
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DNS_SRV1=${VPN_DNS_SRV1:-'8.8.8.8'}
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DNS_SRV2=${VPN_DNS_SRV2:-'8.8.4.4'}
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DNS_SRVS="\"$DNS_SRV1 $DNS_SRV2\""
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[ -n "$VPN_DNS_SRV1" ] && [ -z "$VPN_DNS_SRV2" ] && DNS_SRVS="$DNS_SRV1"
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# Create IPsec config
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conf_bk "/etc/ipsec.conf"
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cat > /etc/ipsec.conf <<EOF
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version 2.0
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config setup
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virtual-private=%v4:10.0.0.0/8,%v4:192.168.0.0/16,%v4:172.16.0.0/12,%v4:!$L2TP_NET,%v4:!$XAUTH_NET
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uniqueids=no
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conn shared
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left=%defaultroute
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leftid=$public_ip
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right=%any
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encapsulation=yes
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authby=secret
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pfs=no
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rekey=no
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keyingtries=5
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dpddelay=30
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dpdtimeout=120
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dpdaction=clear
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ikev2=never
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ike=aes256-sha2,aes128-sha2,aes256-sha1,aes128-sha1,aes256-sha2;modp1024,aes128-sha1;modp1024
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phase2alg=aes_gcm-null,aes128-sha1,aes256-sha1,aes256-sha2_512,aes128-sha2,aes256-sha2
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ikelifetime=24h
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salifetime=24h
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sha2-truncbug=no
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conn l2tp-psk
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auto=add
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leftprotoport=17/1701
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rightprotoport=17/%any
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type=transport
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also=shared
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conn xauth-psk
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auto=add
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leftsubnet=0.0.0.0/0
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rightaddresspool=$XAUTH_POOL
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modecfgdns=$DNS_SRVS
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leftxauthserver=yes
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rightxauthclient=yes
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leftmodecfgserver=yes
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rightmodecfgclient=yes
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modecfgpull=yes
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cisco-unity=yes
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also=shared
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include /etc/ipsec.d/*.conf
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EOF
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if uname -m | grep -qi '^arm'; then
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if ! modprobe -q sha512; then
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sed -i '/phase2alg/s/,aes256-sha2_512//' /etc/ipsec.conf
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fi
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fi
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# Specify IPsec PSK
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conf_bk "/etc/ipsec.secrets"
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cat > /etc/ipsec.secrets <<EOF
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%any %any : PSK "$VPN_IPSEC_PSK"
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EOF
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# Create xl2tpd config
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conf_bk "/etc/xl2tpd/xl2tpd.conf"
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cat > /etc/xl2tpd/xl2tpd.conf <<EOF
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[global]
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port = 1701
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[lns default]
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ip range = $L2TP_POOL
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local ip = $L2TP_LOCAL
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require chap = yes
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refuse pap = yes
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require authentication = yes
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name = l2tpd
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pppoptfile = /etc/ppp/options.xl2tpd
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length bit = yes
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EOF
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# Set xl2tpd options
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conf_bk "/etc/ppp/options.xl2tpd"
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cat > /etc/ppp/options.xl2tpd <<EOF
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+mschap-v2
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ipcp-accept-local
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ipcp-accept-remote
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noccp
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auth
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mtu 1280
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mru 1280
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proxyarp
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lcp-echo-failure 4
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lcp-echo-interval 30
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connect-delay 5000
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ms-dns $DNS_SRV1
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EOF
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if [ -z "$VPN_DNS_SRV1" ] || [ -n "$VPN_DNS_SRV2" ]; then
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cat >> /etc/ppp/options.xl2tpd <<EOF
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ms-dns $DNS_SRV2
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EOF
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fi
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# Create VPN credentials
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conf_bk "/etc/ppp/chap-secrets"
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cat > /etc/ppp/chap-secrets <<EOF
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"$VPN_USER" l2tpd "$VPN_PASSWORD" *
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EOF
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conf_bk "/etc/ipsec.d/passwd"
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VPN_PASSWORD_ENC=$(openssl passwd -1 "$VPN_PASSWORD")
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cat > /etc/ipsec.d/passwd <<EOF
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$VPN_USER:$VPN_PASSWORD_ENC:xauth-psk
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EOF
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bigecho "Updating sysctl settings..."
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if ! grep -qs "hwdsl2 VPN script" /etc/sysctl.conf; then
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conf_bk "/etc/sysctl.conf"
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cat >> /etc/sysctl.conf <<EOF
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# Added by hwdsl2 VPN script
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kernel.msgmnb = 65536
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kernel.msgmax = 65536
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net.ipv4.ip_forward = 1
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net.ipv4.conf.all.accept_redirects = 0
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net.ipv4.conf.all.send_redirects = 0
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net.ipv4.conf.all.rp_filter = 0
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net.ipv4.conf.default.accept_redirects = 0
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net.ipv4.conf.default.send_redirects = 0
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net.ipv4.conf.default.rp_filter = 0
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net.ipv4.conf.$NET_IFACE.send_redirects = 0
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net.ipv4.conf.$NET_IFACE.rp_filter = 0
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net.core.wmem_max = 12582912
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net.core.rmem_max = 12582912
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net.ipv4.tcp_rmem = 10240 87380 12582912
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net.ipv4.tcp_wmem = 10240 87380 12582912
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EOF
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fi
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bigecho "Updating IPTables rules..."
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IPT_FILE=/etc/iptables.rules
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IPT_FILE2=/etc/iptables/rules.v4
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ipt_flag=0
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if ! grep -qs "hwdsl2 VPN script" "$IPT_FILE"; then
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ipt_flag=1
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fi
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ipi='iptables -I INPUT'
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ipf='iptables -I FORWARD'
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ipp='iptables -t nat -I POSTROUTING'
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res='RELATED,ESTABLISHED'
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if [ "$ipt_flag" = "1" ]; then
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service fail2ban stop >/dev/null 2>&1
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iptables-save > "$IPT_FILE.old-$SYS_DT"
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$ipi 1 -p udp --dport 1701 -m policy --dir in --pol none -j DROP
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$ipi 2 -m conntrack --ctstate INVALID -j DROP
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$ipi 3 -m conntrack --ctstate "$res" -j ACCEPT
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$ipi 4 -p udp -m multiport --dports 500,4500 -j ACCEPT
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$ipi 5 -p udp --dport 1701 -m policy --dir in --pol ipsec -j ACCEPT
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$ipi 6 -p udp --dport 1701 -j DROP
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$ipf 1 -m conntrack --ctstate INVALID -j DROP
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$ipf 2 -i "$NET_IFACE" -o ppp+ -m conntrack --ctstate "$res" -j ACCEPT
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$ipf 3 -i ppp+ -o "$NET_IFACE" -j ACCEPT
|
|
$ipf 4 -i ppp+ -o ppp+ -j ACCEPT
|
|
$ipf 5 -i "$NET_IFACE" -d "$XAUTH_NET" -m conntrack --ctstate "$res" -j ACCEPT
|
|
$ipf 6 -s "$XAUTH_NET" -o "$NET_IFACE" -j ACCEPT
|
|
$ipf 7 -s "$XAUTH_NET" -o ppp+ -j ACCEPT
|
|
iptables -A FORWARD -j DROP
|
|
$ipp -s "$XAUTH_NET" -o "$NET_IFACE" -m policy --dir out --pol none -j MASQUERADE
|
|
$ipp -s "$L2TP_NET" -o "$NET_IFACE" -j MASQUERADE
|
|
echo "# Modified by hwdsl2 VPN script" > "$IPT_FILE"
|
|
iptables-save >> "$IPT_FILE"
|
|
|
|
if [ -f "$IPT_FILE2" ]; then
|
|
conf_bk "$IPT_FILE2"
|
|
/bin/cp -f "$IPT_FILE" "$IPT_FILE2"
|
|
fi
|
|
fi
|
|
|
|
bigecho "Enabling services on boot..."
|
|
|
|
IPT_PST=/etc/init.d/iptables-persistent
|
|
IPT_PST2=/usr/share/netfilter-persistent/plugins.d/15-ip4tables
|
|
ipt_load=1
|
|
if [ -f "$IPT_FILE2" ] && { [ -f "$IPT_PST" ] || [ -f "$IPT_PST2" ]; }; then
|
|
ipt_load=0
|
|
fi
|
|
|
|
if [ "$ipt_load" = "1" ]; then
|
|
mkdir -p /etc/network/if-pre-up.d
|
|
cat > /etc/network/if-pre-up.d/iptablesload <<'EOF'
|
|
#!/bin/sh
|
|
iptables-restore < /etc/iptables.rules
|
|
exit 0
|
|
EOF
|
|
chmod +x /etc/network/if-pre-up.d/iptablesload
|
|
|
|
if [ -f /usr/sbin/netplan ]; then
|
|
mkdir -p /etc/systemd/system
|
|
cat > /etc/systemd/system/load-iptables-rules.service <<'EOF'
|
|
[Unit]
|
|
Description = Load /etc/iptables.rules
|
|
DefaultDependencies=no
|
|
|
|
Before=network-pre.target
|
|
Wants=network-pre.target
|
|
|
|
Wants=systemd-modules-load.service local-fs.target
|
|
After=systemd-modules-load.service local-fs.target
|
|
|
|
[Service]
|
|
Type=oneshot
|
|
ExecStart=/etc/network/if-pre-up.d/iptablesload
|
|
|
|
[Install]
|
|
WantedBy=multi-user.target
|
|
EOF
|
|
systemctl enable load-iptables-rules 2>/dev/null
|
|
fi
|
|
fi
|
|
|
|
for svc in fail2ban ipsec xl2tpd; do
|
|
update-rc.d "$svc" enable >/dev/null 2>&1
|
|
systemctl enable "$svc" 2>/dev/null
|
|
done
|
|
|
|
if ! grep -qs "hwdsl2 VPN script" /etc/rc.local; then
|
|
if [ -f /etc/rc.local ]; then
|
|
conf_bk "/etc/rc.local"
|
|
sed --follow-symlinks -i '/^exit 0/d' /etc/rc.local
|
|
else
|
|
echo '#!/bin/sh' > /etc/rc.local
|
|
fi
|
|
cat >> /etc/rc.local <<'EOF'
|
|
|
|
# Added by hwdsl2 VPN script
|
|
(sleep 15
|
|
service ipsec restart
|
|
service xl2tpd restart
|
|
echo 1 > /proc/sys/net/ipv4/ip_forward)&
|
|
exit 0
|
|
EOF
|
|
fi
|
|
|
|
bigecho "Starting services..."
|
|
|
|
sysctl -e -q -p
|
|
|
|
chmod +x /etc/rc.local
|
|
chmod 600 /etc/ipsec.secrets* /etc/ppp/chap-secrets* /etc/ipsec.d/passwd*
|
|
|
|
mkdir -p /run/pluto
|
|
service fail2ban restart 2>/dev/null
|
|
service ipsec restart 2>/dev/null
|
|
service xl2tpd restart 2>/dev/null
|
|
|
|
swan_ver_url="https://dl.ls20.com/v1/$os_type/$os_ver/swanver?arch=$os_arch&ver=$SWAN_VER"
|
|
swan_ver_latest=$(wget -t 3 -T 15 -qO- "$swan_ver_url")
|
|
if printf '%s' "$swan_ver_latest" | grep -Eq '^([3-9]|[1-9][0-9]{1,2})(\.([0-9]|[1-9][0-9]{1,2})){1,2}$' \
|
|
&& [ -n "$SWAN_VER" ] && [ "$SWAN_VER" != "$swan_ver_latest" ] \
|
|
&& printf '%s\n%s' "$SWAN_VER" "$swan_ver_latest" | sort -C -V; then
|
|
cat <<EOF
|
|
|
|
Note: A newer version of Libreswan ($swan_ver_latest) is available.
|
|
To update, run:
|
|
wget https://git.io/vpnupgrade -O vpnup.sh && sudo sh vpnup.sh
|
|
EOF
|
|
fi
|
|
|
|
cat <<EOF
|
|
|
|
================================================
|
|
|
|
IPsec VPN server is now ready for use!
|
|
|
|
Connect to your new VPN with these details:
|
|
|
|
Server IP: $public_ip
|
|
IPsec PSK: $VPN_IPSEC_PSK
|
|
Username: $VPN_USER
|
|
Password: $VPN_PASSWORD
|
|
|
|
Write these down. You'll need them to connect!
|
|
|
|
Important notes: https://git.io/vpnnotes
|
|
Setup VPN clients: https://git.io/vpnclients
|
|
IKEv2 guide: https://git.io/ikev2
|
|
|
|
================================================
|
|
|
|
EOF
|
|
|
|
}
|
|
|
|
## Defer setup until we have the complete script
|
|
vpnsetup "$@"
|
|
|
|
exit 0
|